java语言的海康sdk取流并从中提取h264裸流存入到队列中

具体实现步骤如下：
导入海康sdk相关的jar包，例如hkjvmsdk.jar、hkplayctrl.jar等。
初始化sdk，包括设备登录、获取通道号等。
创建播放器对象，并设置播放器的回调函数，用于接收海康sdk传来的视频数据。
在回调函数中，判断数据类型是否为H264格式，如果是，则将数据存入队列中。
在主程序中，循环从队列中取出数据进行处理，例如保存到文件中。
代码示例：
import com.sun.jna.NativeLong;
import com.sun.jna.Pointer;
import com.sun.jna.ptr.NativeLongByReference;
import com.sun.jna.ptr.PointerByReference;
import com.sun.jna.win32.StdCallLibrary;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

public class HKSdkDemo {

    // 海康SDK相关接口
    public interface HCNetSDK extends StdCallLibrary {
        boolean NET_DVR_Init();

        boolean NET_DVR_Cleanup();

        boolean NET_DVR_SetConnectTime(int dwWaitTime, int dwTryTimes);

        boolean NET_DVR_SetReconnect(int dwInterval, boolean bEnableRecon);

        NativeLong NET_DVR_Login_V30(String sDVRIP, short wDVRPort, String sUserName, String sPassword,
                                     HCNetSDK.NET_DVR_DEVICEINFO_V30 lpDeviceInfo);

        boolean NET_DVR_Logout(NativeLong lUserID);

        NativeLong NET_DVR_RealPlay_V40(NativeLong lUserID,
                                        HCNetSDK.NET_DVR_PREVIEWINFO lpPreviewInfo,
                                        HCNetSDK.REALDATACALLBACK_V30 fRealDataCallBack_V30,
                                        Pointer pUser);

        boolean NET_DVR_StopRealPlay(NativeLong lRealHandle);

        boolean NET_DVR_MakeKeyFrame(NativeLong lUserID, NativeLong lChannel);

        boolean NET_DVR_SetStandardDataCallBack(NativeLong lRealHandle,
                                                 HCNetSDK.STANDARDDATACALLBACK fStdDataCallback,
                                                 Pointer pUserData);

        interface REALDATACALLBACK_V30 extends StdCallCallback {
            void invoke(NativeLong lRealHandle, int dwDataType, Pointer pBuffer, int dwBufSize, Pointer pUser);
        }

        interface STANDARDDATACALLBACK extends StdCallCallback {
            void invoke(NativeLong lRealHandle, int dwDataType, Pointer pBuffer, int dwBufSize, Pointer pUser);
        }

        class NET_DVR_DEVICEINFO_V30 extends Structure {
            byte[] sSerialNumber = new byte[48];
            byte byAlarmInPortNum;
            byte byAlarmOutPortNum;
            byte byDiskNum;
            byte byDVRType;
            byte byChanNum;
            byte byStartChan;
            byte byAudioChanNum;
            byte byIPChanNum;
            byte[] byRes1 = new byte[24];
            Pointer struDeviceV30 = null;
            byte[] byRes2 = new byte[128];
        }

        class NET_DVR_PREVIEWINFO extends Structure {
            public NativeLong lChannel;
            public int dwStreamType;
            public int dwLinkMode;
            public Pointer hPlayWnd;
            public boolean bBlocked;
            public boolean bPassbackRecord;
            public byte byPreviewMode;
            public byte[] byRes = new byte[255];
        }
    }

    private static class HkSdkManager {
        private HCNetSDK hcNetSDK;
        private NativeLong lUserID;
        private BlockingQueue<byte[]> queue;

        public HkSdkManager(String ip, short port, String username, String password, int channelNum) {
            hcNetSDK = HCNetSDK.INSTANCE;
            queue = new LinkedBlockingQueue<>();

            // 初始化sdk
            hcNetSDK.NET_DVR_Init();
            hcNetSDK.NET_DVR_SetConnectTime(3000, 1);
            hcNetSDK.NET_DVR_SetReconnect(10000, true);

            // 登录设备
            HCNetSDK.NET_DVR_DEVICEINFO_V30 deviceInfo = new HCNetSDK.NET_DVR_DEVICEINFO_V30();
            lUserID = hcNetSDK.NET_DVR_Login_V30(ip, port, username, password, deviceInfo);

            // 创建播放器对象
            HCNetSDK.NET_DVR_PREVIEWINFO previewInfo = new HCNetSDK.NET_DVR_PREVIEWINFO();
            previewInfo.lChannel = new NativeLong(channelNum);
            previewInfo.dwStreamType = 0;
            previewInfo.dwLinkMode = 0;
            previewInfo.hPlayWnd = null;
            previewInfo.bBlocked = true;
            previewInfo.bPassbackRecord = false;
            previewInfo.byPreviewMode = 0;

            NativeLongByReference lRealHandle = new NativeLongByReference();
            lRealHandle.setValue(new NativeLong(-1));
            HCNetSDK.REALDATACALLBACK_V30 realDataCallback = new HCNetSDK.REALDATACALLBACK_V30() {
                @Override
                public void invoke(NativeLong lRealHandle, int dwDataType, Pointer pBuffer, int dwBufSize, Pointer pUser) {
                    // 判断数据类型是否为H264格式
                    if (dwDataType == 1) {
                        byte[] data = pBuffer.getByteArray(0, dwBufSize);
                        queue.offer(data); // 存入队列
                    }
                }
            };
            hcNetSDK.NET_DVR_RealPlay_V40(lUserID, previewInfo, realDataCallback, null);

            // 设置播放器的标准数据回调函数
            HCNetSDK.STANDARDDATACALLBACK stdDataCallback = new HCNetSDK.STANDARDDATACALLBACK() {
                @Override
                public void invoke(NativeLong lRealHandle, int dwDataType, Pointer pBuffer, int dwBufSize, Pointer pUser) {

                }
            };
            hcNetSDK.NET_DVR_SetStandardDataCallBack(lRealHandle.getValue(), stdDataCallback, null);
        }

        public byte[] takeData() throws InterruptedException {
            return queue.take();
        }

        public void release() {
            // 停止播放器
            hcNetSDK.NET_DVR_StopRealPlay(lUserID);

            // 登出设备
            hcNetSDK.NET_DVR_Logout(lUserID);

            // 释放sdk资源
            hcNetSDK.NET_DVR_Cleanup();
        }
    }

    public static void main(String[] args) {
        String ip = "192.168.1.1";
        short port = 8000;
        String username = "admin";
        String password = "admin123";
        int channelNum = 1;

        HkSdkManager hkSdkManager = new HkSdkManager(ip, port, username, password, channelNum);
        try {
            while (true) {
                byte[] data = hkSdkManager.takeData(); // 从队列中取出数据
                // 处理数据，例如保存到文件中
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            hkSdkManager.release();
        }
    }
}
``